/* header组件样式 */
.header {
    display:flex;
    flex-direction: column;
    align-items:center;
    width:100%;
    height:100%;
    padding-top:57px;
    background:url(./header_bg.png) no-repeat;
    background-size:cover;
}
.header-title {
    margin-bottom:17px;
    color:#fff;
    font-size:18px;
    text-shadow:0 2px 4px rgba(0,0,0,.5);
}